What is the purpose of the eyes iris and why does it’s colour vary among individuals?
In: Biology
Its connected to sphincter muscle, just like your butt (how’s that for the 5 in ELI5). The hole in this case is the pupil.
The iris color is made of the same pigment (melanin) that colors your hair and skin and blood (why albinos sometimes have red eyes)
Darker colored irises help to block more sunlight from coming through the eye outsode the pupil, giving better vision in bright light, and adding protection from UV damage to the eye.
As someone with light blue eyes, I can definitely agree that I adjust better (faster and I can make out more details) in the dark than my friends with brown eyes. As for light, even if the sun is behind clouds, it’s still sometimes too bright and hurts my eyes to look straight ahead at eye level so I squint or look down. (Snow in the winter is even worse because it reflects the light so I can’t even look down).
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